The Fortress of Fenestrelle is a historic military fortification located in the Piedmont region of Italy. Constructed between 1720 and 1850, it was built by the Savoyard state to defend against potential invasions from France. The fortress features impressive stone walls and a complex system of bastions, making it one of the largest fortifications in Europe. Throughout its history, the fortress played a significant role during various conflicts, including the Italian Wars of Independence. After its military use declined, the fortress fell into disrepair but has since been restored and is now a popular tourist attraction, showcasing its architectural and historical significance.